Biotinylation 2025 by Iris Biotech GmbH

BIOTINYLATION REAGENTS

Empowering Peptide Innovation

With this guiding theme in mind, Iris Biotech’s mission is to support researchers by supplying

• innovative technologies,

• rare compounds,

• as well as a broad portfolio on standard consumables, available in flexible quantities from small scale to bulk quantities. To fulfill our dedication “Empowering Peptide Innovation”, we are attending various conferences, symposia, and exhibitions each year. This allows us to remain in direct contact with scientists all over the world, both from academia and industry, to exchange knowledge, and to gather new ideas to tackle your current challenges.

Guided by our dedication to provide

• competent service,

• as well as novel substances and latest technologies,

Iris Biotech is your trusted partner for the world of peptides, while having strong expertise in associated disciplines. Thus, our portfolio comprises reagents and tools for the synthesis and modification of peptides, e.g., amino acids, resins and solvents but also for related technologies such as drug delivery, linkerology® and life sciences.

Owed to the growing demand for tailor-made compounds, our portfolio is fine-tuned by our custom synthesis service at Iris Biotech Laboratories. Our skilled scientists offer profound expertise in de novo route development,

• upscaling towards larger scale production,

• as well as synthesis optimization for increased efficiency.

Examples are the synthesis of rare chiral building blocks, unnatural amino acid derivatives, sophisticated orthogonal protecting groups, heterocycles, building blocks for nucleotides, PEGs and PEG-analogs as well as specific linkers for controlled drug delivery and release.

Portfolio Overview

Peptide Synthesis and Modification

(Protected) Amino Acids

Standards such as Fmoc-D/L-AAA and Boc-D/L-AAA, Smoc amino acids for peptide synthesis in water, variety of protecting groups (e.g., Pbf, Trt, tBu, Bzl, Acm, Mob, SIT, Phacm, Allocam, Mmt), unusual amino acids, fluorinated derivatives, substituted prolines, arginine analogs

Building Blocks

Amino alcohols, amino aldehydes, diamines and hydrazines, (pseudoproline) dipeptides, polyamines and spermines, fatty acid derivatives, peptide nucleic acids (PNAs)

Reagents

Coupling reagents, solvents and scavengers, protecting groups

Resins

Preloaded resins (e.g., based on Trityl, TCP, TentaGel, Methoxybenzhydryl, Merrifield, PAM, Rink, Wang), scavenger resins, hydrazone resins, poly(acrylamide) resins, Cyclover

Linkerology® and Drug Delivery Life Sciences

Linkers for Solid Phase Peptide Synthesis

Cleavable Linkers

Val-Ala-based, Val-Cit-based, disulfide-based, Dde-helping hands, pH-sensitive linkers

Photo-Activatable Linkers

Functionalized Linkers

Clickable linkers, trifunctional linkers, linkers with maleimide function, cross-linkers, selective N-term acylation and biotinylation, 5HP2O

PROTACs

Ligands, linkers & modules

Fullerenes, Poly(2-oxazolines), Dextrans & Plant-Derived Cholesterol

Superparamagnetic Iron Oxide Nanoparticles

Poly-Amino Acids

Poly-Arg, Poly-Glu, Poly-Lys, Poly-Orn, Poly-Sar

PEGylation

Branched PEGylating reagents, (amino-)PEG-acids, PEG-amines & hydrazides & guanidines, reagents for Click-conjugation, Biotin-PEG-reagents, PEG-thiols, PEG-maleimides, other PEGylating reagents

Biotinylation Reagents

Carbohydrates

Galactose, Glucose, Mannose, Xylose and others

Drug Metabolites

Peptides

Substrates & Inhibitors

E.g., protein kinase inhibitors, substrates for fusion (Halo/ Snap/Clip)-tagged proteins

Natural Products

Dyes and Fluorescent Labels

E.g., ICG, AMC, DAPI

Maillard & Amadori Reaction Products

Large portfolio of derivatives useful as standards for food, pharma and cosmetics industry

Vitamins

Custom Synthesis

Your project requires a compound not listed in our portfolio? Get in contact and inquire about our custom synthesis capabilities.

Our experienced scientists are excited to accept your synthetic challenge! In such cases, your request undergoes the following stages:

Step-by-Step Analysis

Customer’s demands

Process Evaluation

Det ailed literature review

Synthetic possibilities

Strategy Development

Protocol development

Method development and validation

• Customized synthesis

Our Service Promise

Quality Consistency

• Identity confirmation Purity verification

All our services are based on high standards, transparency & documentation, trust, honesty & confidentiality, as well as the required know-how.

High Standards

Values: sustainability & responsibility

State-of-the-art equipment & latest technologies

High quality standards

Qualified suppliers & regular audits

Trust, Honesty & Confidentiality

Intergenerational business valuing partnerships

• Meeting the customer‘s expectations

• Integrity towards our customers

Transparency & Documentation

Talk to our specialists – customer care

Certificates of analysis & origin

Impurity profiling

Safety data sheets

• Analytical and process reports

Our Know-How

One-step reactions & complex multi-step synthesis

• Scalability from mg to kg quantities

• Route scouting

Biotinylation Reagents

1. Background

Biotinylation describes the attachment of biotin to a protein or other macromolecule. The selective isolation of such biotin-containing molecules out of complex mixtures is based on the high affinity of avidin and streptavidin for biotin, representing one of the strongest known non-covalent interactions between protein and ligand (K d = 10-15 M) and being unaffected by variations of e.g., pH, temperature, or organic solvents. Furthermore, biotin is a rather small molecule compared to other labels, minimalizing its steric impact on the biotinylated carrier itself. Thus, this nonradioactive method represents a highly important and versatile tool for purification, immobilization, and labeling.

Fig. 1: Chemical structure of biotin, 2-iminobiotin, and desthiobiotin. Valeric acid moiety is highlighted in red.

As biotin bears a valeric acid side-chain, it can easily be derivatized without affecting its (strept)avidinbinding site. The reactivity can be tailored towards various functional groups, e.g., primary amines, sulfhydryls and carboxyls, as well as derivatives with various linker lengths to adjust the availability of biotin for (strept)avidin binding, with incorporated PEG moieties for improved solubility, with cleavable conjugates, or for reversible biotin labelling. This range of possibilities allows to perfectly suit the biotinylation reagent for the required application.

2-Iminobiotin and desthiobiotin also bind tightly to (strept)avidin, however, not as strong as biotin. Compounds labelled with 2-iminobiotin and desthiobiotin can therefore be gently stripped from accordingly labeled targets with buffered biotin solutions avoiding harsh denaturation conditions such as 6 M GdmCl.

You need further details about our custom synthesis capabilities?

Get in contact!

+49 (0) 9231 97121-0

+49 (0) 9231 97121-99

info@iris-biotech.de www.iris-biotech.de

Fig. 2: Range of chemical reactivity variations for biotinylation.

Selecting the right biotinylation reagent to use for a specific application and protein of interest depends on a number of factors that must be carefully considered and optimized, including:

Solubility – Modifications in biotinylation reagent solubility allow access to target proteins in hydrophobic or hydrophilic environments and influence the solubility of the biotinylated protein.

• Spacer arm length – The availability of biotin for (strept)avidin binding might be influenced by the length of the spacer arm.

• Cleavability/reversibility – Captured biotinylated proteins can be recovered or purified by cleaving the biotin molecule from the target protein or reversing attenuated biotin-(strept)avidin interactions.

Functional group – Specific reactive moieties bind to certain amino acids or to the functional groups of specific amino acids for nonselective or targeted biotinylation, respectively.

Overcoming the Hydrophobic Nature of Biotin

Typical biotinylation with biotin-NHS normally results in multiple attachments, as several lysines are usually present on protein surfaces. Hence, the hydrophobic properties of biotin will influence surface polarity and solubility in aqueous conditions. In case such biotin labelling has a negative impact on the above listed protein properties, incorporation of a PEG unit between the conjugation point and biotin itself is a standard method of choice to maintain or improve physical properties of the modified protein.

PEGs are molecules comprised of repeating ethylene glycol units with solubility enhancing properties both in hydrophobic and hydrophilic environment. PEGs are considered as non-immunogenic and show promising results in numerous applications. They have a dramatic impact on protein solubility, stability, and aggregation, and improve ELISAs, IHC assays, and formulations in many aspects.

Biotinylation Reagents

Some protein-biotin conjugates are particularly susceptible to aggregation and loss of antigen binding ability, which can complicate assays and provide irreproducible and/or erroneous results. In comparison, biotinylated IgGs employing a PEG linker show much lower tendency for aggregation, maintain a high affinity for the antigen, and the resulting complexes with the biotin-binding proteins remain completely soluble.

References:

→ Spatiotemporal profiling of cytosolic signaling complexes in living cells by selective proximity proteomics; M. Ke, X. Yuan, A. He, P. Yu, W. Chen, Y. Shi, T. Hunter, P. Zou, R. Tian; Nat Commun 2021; 12: 71. arrow-up-right-from-square https://doi.org/10.1038/s41467-020-20367-x

→ Expanding APEX2 Substrates for Proximity-Dependent Labeling of Nucleic Acids and Proteins in Living Cells; Y. Zhou, G. Wang, P. Wang, Z. Li, T. Yue, J. Wang, P. Zou; Angew Chem Int Ed 2019; 58: 11763-11767. arrow-up-right-from-square https://doi.org/10.1002/anie.201905949

→ Mapping spatial transcriptome with light-activated proximity-dependent RNA labeling; P. Wang, W. Tang, Z. Li, Z. Zou, Y. Zhou, R. Li, T. Xiong, J. Wang, P. Zou; Nat Chem Biol 2019; 15: 1110-1119. arrow-up-right-from-square https://doi.org/10.1038/s41589-019-0368-5

→ Proximity-dependent labeling methods for proteomic profiling in living cells; C. L. Chen, N. Perrimon; Wiley Interdiscip Rev Dev Biol 2017; 6: e272. arrow-up-right-from-square https://doi.org/10.1002/wdev.272

→ Quantitative Analytical Method for the Determination of Biotinidase Activity in Dried Blood Spot Samples; E. Szabo, I. Szatmari, L. Szonyi, Z. Takats; Anal Chem 2015; 87: 10573-8. arrow-up-right-from-square https://doi.org/10.1021/acs.analchem.5b02996

→ Triazole biotin: a tight-binding biotinidase-resistant conjugate; A. I. Germeroth, J. R. Hanna, R. Karim, F. Kundel, J. Lowther, P. G. Neate, E. A. Blackburn, M. A. Wear, D. J. Campopiano, A. N. Hulme; Org Biomol Chem 2013; 11: 7700-4. arrow-up-right-from-square https://doi.org/10.1039/c3ob41837e

→ Design and synthesis of ATP-based nucleotide analogues and profiling of nucleotide-binding proteins; J. C. Wolters, G. Roelfes, B. Poolman; Bioconjug Chem 2011; 22: 1345-53. arrow-up-right-from-square https://doi.org/10.1021/bc100592q

→ Tyramide signal amplification for analysis of kinase activity by intracellular flow cytometry; M. R. Clutter, G. C. Heffner, P. O. Krutzik, K. L. Sachen, G. P. Nolan; Cytometry A 2010; 77: 1020-31. arrow-up-right-from-square https://doi.org/10.1002/cyto.a.20970

→ Biotinyl-methyl 4-(amidomethyl)benzoate is a competitive inhibitor of human biotinidase; K. A. Kobza, K. Chaiseeda, G. Sarath, J. M. Takacs, J. Zempleni; J Nutr Biochem 2008; 19: 826-32. arrow-up-right-from-square https://doi.org/10.1016/j.jnutbio.2007.11.002

→ Fabrication and characterization of heparin functionalized membrane-mimetic assemblies; P. Y. Tseng, S. M. Rele, X. L. Sun, E. L. Chaikof; Biomaterials 2006; 27: 2627-36. arrow-up-right-from-square https://doi.org/10.1016/j.biomaterials.2005.10.032

→ Site-specific protein modification through Cu(I)-catalyzed 1,2,3-triazole formation and its implementation in protein microarray fabrication; P. C. Lin, S. H. Ueng, M. C. Tseng, J. L. Ko, K. T. Huang, S. C. Yu, A. K. Adak, Y. J. Chen, C. C. Lin; Angew Chem Int Ed 2006; 45: 4286-90. arrow-up-right-from-square https://doi.org/10.1002/anie.200600756

→ Qualitative colorimetric ultramicroassay for the detection of biotinidase deficiency in newborns; E. C. Gonzalez, N. Marrero, A. Frometa, D. Herrera, E. Castells, P. L. Perez; Clin Chim Acta 2006; 369: 35-9. arrow-up-right-from-square https://doi.org/10.1016/j.cca.2006.01.009

→ Quantification of streptavidin adsorption in microtitration wells; L. Valimaa, K. Pettersson, J. Rosenberg, M. Karp, T. Lovgren; Anal Biochem 2004; 331: 376-84. arrow-up-right-from-square https://doi.org/10.1016/j.ab.2004.04.003

→ Artificial metalloenzymes: (strept)avidin as host for enantioselective hydrogenation by achiral biotinylated rhodium-diphosphine complexes; M. Skander, N. Humbert, J. Collot, J. Gradinaru, G. Klein, A. Loosli, J. Sauser, A. Zocchi, F. Gilardoni, T. R. Ward; J Am Chem Soc 2004; 126: 14411-8. arrow-up-right-from-square https://doi.org/10.1021/ja0476718

→ Purification and characterization of human serum biotinidase; J. Chauhan, K. Dakshinamurti; J. Biol. Chem. 1986; 261(9) : 4268-4275. arrow-up-right-from-square https://doi.org/10.1016/S0021-9258(17)35656-9

2. Amine-Reactive Biotinylation Reagents

Active esters such as N-hydroxysuccinimide (NHS) esters permit a catalyst-free conjugation reaction to amines, e.g., of lysine side-chains and the N-terminus, under mild conditions. Yet, NHS esters may hydrolyze over time if, for example, atmospheric moisture has condensed on the substance. As alternatives, tetrafluorophenyl (TFP) and pentafluorophenyl (PFP) active esters can be applied that are much more resistant to hydrolysis.

RL-1006 Biotin-OSu

N-Hydroxysuccinimidobiotin

CAS-No. 35013-72-0

Formula C14H19 N3 O 5 S Mol. weight 341,39 g/mol

RL-8615 Biotin-PFP

Biotin pentafluorophenyl ester

CAS-No. 120550-35-8

Formula C16 H15F5N2O 3 S Mol. weight 410,36 g/mol

LS-1650 D-Desthiobiotin

(4R,5S)-5-methyl-2-oxo-4-Imidazolidinehexanoic acid

CAS-No. 533-48-2

Formula C10 H18 N2O 3 Mol. weight 214,27 g/mol

RL-2025 Biotin-Ahx-OH

6-Biotinylamino-hexanoic acid

CAS-No. 72040-64-3

Formula C16 H27N3 O4 S Mol. weight 357,47 g/mol

Biotinylation Reagents

RL-2020

Biotin-Ahx-NHS

6-Biotinylamino-hexanoic acid-N-hydroxysuccinimidyl ester

CAS-No. 72040-63-2

Formula C 20 H30 N4O 6 S Mol. weight 454,54 g/mol

LS-1680 Sulfo-NHS-Biotin

Biotin 3-sulfo-N-hydroxysuccinimide ester sodium salt

CAS-No. 194041-65-1

Formula C14H18 N3 NaO 8 S 2 Mol. weight 443,42 g/mol

RL-3880 Biotin-Aca-PFP

Biotin-6-aminohexanoic acid pentafluorophenyl ester

CAS-No. 273207-85-5

Formula C 22H26 F5N3 O4 S Mol. weight 523,52 g/mol

PEG2560 Biotin-O2Oc-OH

8-Biotinylamido-3,6-dioxaoctanoic acid

CAS-No. 1238575-77-3

Formula C16 H27N3 O 6 S Mol. weight 389,47 g/mol

PEG5280 Biotin-TOTA-glutaramic acid*DIPEA

5,21-dioxo-25-((3aS,4S,6aR)-2-oxohexahydro-1Hthieno[3,4-d]imidazol-4-yl)-10,13,16-trioxa-6,20-diazapentacosan-1-oic acid diisopropylethylamine salt

CAS-No. 1205744-09-7

Formula C 25H44N4O 8 S*C 8 H19 N Mol. weight 560,70*129,30 g/mol

PEG2565

Biotin-O2Oc-O2Oc-OH

8-Biotinylamido-3,6-dioxaoctanoic acid dimer

CAS-No. 1301706-65-9

Formula C 22H38 N4O 9 S Mol. weight 534,62 g/mol

PEG1515

Biotin-PEG(4)-COOH

15-Biotinamino-4,7,10,13-tetraoxa-pentadecanoic acid

CAS-No. 721431-18-1

Formula C 21H37N3 O 8 S Mol. weight 491,6 g/mol

PEG1870

Biotin-PEG(4)-NHS

15-Biotinamino-4,7,10,13-tetraoxa-pentadecanoic acid succinimidyl ester

CAS-No. 459426-22-3

Formula C 25H40 N4O 10 S Mol. weight 588,67 g/mol

PEG1845

Biotin-PEG(4)-NHS-(Biotinidase resistant)

18-Biotinamino-17-oxo-4,7,10,13-tetraoxa-16-azaicosan1-oic acid succinimidyl ester

CAS-No. 1334172-61-0

Formula C 29 H47N 5 O 11 S Mol. weight 673,78 g/mol

PEG7760

Biotin-PEG(4)-TFP-(Biotinidase resistant)

18-Biotinamino-17-oxo-4,7,10,13-tetraoxa-16-azaicosan1-oic acid (2,3,5,6-tetrafluorophenyl) ester

Formula C 31H44F4N4O 9 S Mol. weight 724,76 g/mol

PEG2071

Biotin-TEG-TFP

Biotin-tetra(ethylene glycol)-2,3,5,6-tetrafluorphenyl ester

CAS-No. 2985664-57-9

Formula C 27H37F4N3 O 8 S Mol. weight 639,66 g/mol

PEG6690

Biotin-PEG(6)-COOH

21-[D(+)-Biotinylamino]-4,7,10,13,16,19-hexaoxaheneicosanoic acid

CAS-No. 1352814-10-8

Formula C 25H45N3 O 10 S Mol. weight 579,7 g/mol

Biotinylation Reagents

PEG1051

Biotin-PEG(12)-COOH

alpha-Biotin-omega-(propionic acid)-dodecae(ethylene glycol)

CAS-No. 948595-11-7

Formula C 37H 69 N3 O 16 S Mol. weight 844,04 g/mol

PEG1860

Biotin-PEG(12)-NHS

alpha-Biotin-omega-carboxy succinimidyl ester dodeca(ethylene glycol)

CAS-No. 365441-71-0

Formula C 41H72N4O 18 S Mol. weight 941,09 g/mol

PEG5130

Biotin-PEG(12)-TFP

alpha-Biotin-omega-propionic acid (2,3,5,6-tetrafluorophenyl) ester dodeca(ethylene glycol)

CAS-No. 3017961-69-9

Formula C 43 H 69 F4N3 O 16 S Mol. weight 992,08 g/mol

PEG7770

Biotin-PEG(12)-TFP-(Biotinidase resistant)

alpha-Biotinyl-(2-aminobutyryl)-omega-(2,3,5,6-tetrafluorophenyl propionate) dodeca(ethylene glycol)

Formula C 47H76 F4N4O 17S Mol. weight 1077,18 g/mol

PEG4260

Biotin-PEG(24)-COOH

alpha-Biotin-omega-(propionic acid) 24(ethylene glycol)

CAS-No. 721431-18-1

Formula C 61H117N3 O 28 S Mol. weight 1372,65 g/mol

PEG4250

Biotin-PEG(24)-NHS

alpha-Biotin-omega-(succinimidyl propionate) 24(ethylene glycol)

CAS-No. 365441-71-0

Formula C 65H120 N4O 30 S Mol. weight 1469,72 g/mol

PEG7750

Biotin-PEG(24)-TFP

alpha-Biotin-omega-(2,3,5,6-tetrafluorophenyl propionate) 24(ethylene glycol)

Formula C 67H117F4N3 O 28 S Mol. weight 1520,71 g/mol

PEG4270

Biotin-PEG(48)-COOH

alpha-Biotin-omega-(propionic acid) 48(ethylene glycol)

CAS-No. 721431-18-1

Formula C112H218 N4O 53 S Mol. weight 2500,99 g/mol

PEG1053

Biotin-PEG-COOH (3 kDa)

alpha-Biotin-omega-carboxy poly(ethylene glycol)

Mol. weight 3000 Da

PEG1054

Biotin-PEG-COOH (5 kDa)

alpha-Biotin-omega-carboxy poly(ethylene glycol)

Mol. weight 5000 Da

PEG1052

Biotin-PEG-COOH (10 kDa)

alpha-Biotin-omega-carboxy poly(ethylene glycol)

Mol. weight 10000 Da

PEG1056

Biotin-PEG-NHS (3 kDa)

alpha-Biotin-omega-carboxy succinimidyl ester poly(ethylene glycol)

Mol. weight 3000 Da

Biotinylation Reagents

PEG1057

Biotin-PEG-NHS (5 kDa)

alpha-Biotin-omega-carboxy succinimidyl ester poly(ethylene glycol)

Mol. weight 5000 Da

Product details

PEG1055

Biotin-PEG-NHS (10 kDa)

alpha-Biotin-omega-carboxy succinimidyl ester poly(ethylene glycol)

Mol. weight 10000 Da

Fig. 3: Squaric acid ethyl esters chemoselectively bind to the amino side-chain functions of lysine in proteins, whereas the guanidine function of arginine, the hydroxyl groups of serine and threonine and the imidazole function of histidine are not affected.

Product details

RL-8430

Biotin-Hx-SQA

N-(6-((2-ethoxy-3,4-dioxocyclobut-1-en-1-yl)amino)hexyl)-5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d] imidazol-4-yl)pentanamide

Formula

Mol. weight 466,60 g/mol

PEG6590

Biotin-PEG-SQA (3 kDa)

alpha-Biotin-omega-squaric acid ethyl ester poly(ethylene glycol)

Mol. weight 3000 Da

PEG6595

Biotin-PEG-SQA (5 kDa)

alpha-Biotin-omega-squaric acid ethyl ester poly(ethylene glycol)

Mol. weight 5000 Da

PEG6580

Biotin-PEG-SQA (10 kDa)

alpha-Biotin-omega-squaric acid ethyl ester poly(ethylene glycol)

Mol. weight 10000 Da

PEG6585

Biotin-PEG-SQA (20 kDa)

alpha-Biotin-omega-squaric acid ethyl ester poly(ethylene glycol)

Mol. weight 20000 Da

References:

→ Synthesis and reactivity of compounds with cyclobutane ring(s). 10. Syntheses of squaric acid, its monoorthoesters, and related derivatives via [2 + 2] cycloadditions of tetraalkoxyethylenes with heterosubstituted ketenes; D. Bellus; J. Org. Chem. 2002; 44: 1208-1211. arrow-up-right-from-square https://doi.org/10.1021/jo01322a004

→ Be squared: expanding the horizon of squaric acid-mediated conjugations; F. R. Wurm, H. A. Klok; Chem Soc Rev 2013; 42: 8220-36. arrow-up-right-from-square https://doi.org/10.1039/c3cs60153f

Biotin-PABA is a carboxylic acid terminated biotin derivative and as such amine reactive for chemical biotinylations of amino functions, e.g., of lysines. Its main use is as a substrate for biotinidase, which cleaves biotin-amide to release biotin in vivo. As byproduct, para-amino benzoic acid is released, which can be quantified by either fluorescent or colorimetric methods.

Product details

LS-4200 Biotin-PABA

4-(5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d] imidazol-4-yl)pentanamido)benzoic acid

CAS-No. 6929-40-4

Formula C17H21N3 O4 S Mol. weight 363,43 g/mol

Reference:

Biotinylation Reagents

3. Carboxy-Reactive Biotinylation Reagents

Carboxy groups are present on aspartic acid and glutamate side-chains, as well as on the carboxyterminal ends, and can be reacted with amino-bearing biotinylation reagents in the presence of a coupling reagent, e.g., EDC.

RL-8435 Norbiotinamine*HCl

(3aS,4S,6aR)-4-(4-aminobutyl)tetrahydro-1H-thieno[3,4-d]imidazol-2(3H)-one hydrochloride

CAS-No. 160385-86-4

Formula C9 H17N3 OS*HCl Mol. weight 215,32*36,45 g/mol

RL-3391 Biotin-cystamine*TFA

Biotinamidoethyldisulfanyl(2-aminoethane) trifluoroacetate

CAS-No. 880491-09-8

Formula C14H26 N4O 2 S 3*CF 3 COOH Mol. weight 378,58*114,02 g/mol

LS-1690 Biotinyl-DAPr*TFA

N-(+)-Biotinyl-3-aminopropylammonium trifluoroacetate

CAS-No. 244760-26-7

Formula C13 H24N4O 2 S*CF 3 CO 2H Mol. weight 300,42*114,02 g/mol

RL-2030 Biotin cadaverine nTFA

5-(Biotinamido)pentylamine nTFA

CAS-No. 288259-39-2

Formula C15H28 N4O 2 S nC 2HF 3 O 2 Mol. weight 328,47 net g/mol

LS-1670 Biotinyl cadaverine

N-(5-aminopentyl)biotinamide

CAS-No. 115416-38-1

Formula C15H28 N4O 2 S Mol. weight 328,48 g/mol

PEG2760 Biotin-DOOA*HCl

1-Biotinyl-3,6-dioxa-8-octaneamine hydrochloride

CAS-No. 862373-14-6

Formula C16 H30 N4O4 S*HCl Mol. weight 374,50*36,45 g/mol

RL-4060 Biotin-DOOA

Biotinyl-1-amino-3,6-dioxa-8-octanamine

CAS-No. 138529-46-1

Formula C16 H30 N4O4 S Mol. weight 374,50 g/mol

PEG8050 Biotin-TOTA

N-(13-amino-4,7,10-trioxatridecanyl)-D-biotinamide

CAS-No. 183896-00-6

Formula C 20 H38 N4O 5 S Mol. weight 446,6 g/mol

RL-4210 Biotin-PEG(3)-NH2

N-[2-[2-[2-(2-Aminoethoxy)ethoxy]ethoxy]ethyl]biotinamide

CAS-No. 359860-27-8

Formula C18 H34N4O 5 S Mol. weight 418,22 g/mol

PEG2110 Biotin-PEG(3)-NH2*TFA

N-Biotin-3,3‘-(2,2‘-oxybis(ethane-2,1-diyl)bis(oxy)) dipropan-1-amine trifluoroacetate

CAS-No. 1334172-59-6

Formula C 20 H38 N4O 5 S*CF 2CO 2H Mol. weight 446,60*114,01 g/mol

PEG5140 Biotin-TEG-O-NH2*HCl

N-(2-(2-(2-(2-(aminooxy)ethoxy)ethoxy)ethoxy) ethyl)-5-biotinamide hydrochloride

CAS-No. 1951424-88-6

Formula C18 H34N4O 6 S*HCl Mol. weight 434,55*36,45 g/mol

Biotinylation Reagents

PEG1425

Biotin-PEG(4)-NHNH2

15-Biotinamino-4,7,10,13-tetraoxa-pentadecanoyl hydrazide

CAS-No. 756525-97-0

Formula C 21H39 N 5 O 7S Mol. weight 505,63 g/mol

PEG4290

Biotin-PEG(7)-NH2

alpha-Biotin-omega-amino hepta(ethylene glycol)

CAS-No. 1334172-76-7

Formula C 26 H 50 N4O 9 S Mol. weight 594,76 g/mol

PEG1044

Biotin-PEG(9)-NH2

alpha-Biotin-omega-amino-nona(ethylene glycol)

CAS-No. 960132-48-3

Formula C 30 H 58 N4O 11 S Mol. weight 682,88 g/mol

PEG4300

Biotin-PEG(11)-NH2

alpha-Biotin-omega-amino undeca(ethylene glycol)

CAS-No. 604786-74-5

Formula C 34H 66 N4O 13 S Mol. weight 770,97 g/mol

PEG4680

Biotin-PEG(11)-O-NH2*HCl

alpha-Biotinyl-omega-oxyamine-undeca(ethylene glycol) hydrochloride

Formula C 34H 66 N4O 14 S Mol. weight 786,97*36,45 g/mol

PEG4310

Biotin-PEG(23)-NH2

alpha-Biotin-omega-amino 23(ethylene glycol)

CAS-No. 604786-74-5

Formula C 58 H114N4O 25 S Mol. weight 1299,6 g/mol

PEG1046

Biotin-PEG-NH2 (3 kDa)

alpha-Biotin-omega-amino poly(ethylene glycol)

CAS-No. 604786-74-5

Mol. weight 3000 Da

PEG1047

Biotin-PEG-NH2 (5 kDa)

alpha-Biotin-omega-amino poly(ethylene glycol)

CAS-No. 604786-74-5

Mol. weight 5000 Da

PEG1045

Biotin-PEG-NH2 (10 kDa)

alpha-Biotin-omega-amino poly(ethylene glycol)

CAS-No. 604786-74-5

Mol. weight 10000 Da

. circle-arrow-right

Find more information and background on PEGylation in our booklet PEGylation!

Biotinylation Reagents

4. Reagents for Various Protein and RNA Biotinylations

Tyramine Derivatives

Tyramine derivatives such as biotin-tyramide are converted to radicals by horseradish peroxidase (HRP) in the presence of H2 O 2 . These highly reactive species preferentially react with tyrosine residues of proteins, a property that is employed in many applications such as protein labeling, in situ hybridization, electron microscopy, ELISA, phage display, and others. Biotin-tyramide is a valuable tool for signal amplification and can significantly improve signal-to-noise ratios.

horseradish peroxidase

Fig. 4: Selective biotinylation of proteins at the position of tyrosine with biotin-tyramide. Product

LS-3500 Biotin Tyramide

(3aS,4S,6aR)-hexahydro-N-[2-(4-hydroxyphenyl)ethyl]2-oxo-1H-thieno[3,4-d]imidazole-4-pentanamide

CAS-No. 41994-02-9

Formula C18 H25N3 O 3 S Mol. weight 363,47 g/mol

LS-1660 Desthiobiotin-Tyramide

N-(4-hydroxyphenethyl)-6-((4R,5S)-5-methyl-2-oxoimidazolidin-4-yl)hexanamide

CAS-No. 2242902-55-0

Formula C18 H27N3 O 3 Mol. weight 333,43 g/mol

LS-4060

Biotin-Dimethyl-Tyramide

N-(1-(4-hydroxyphenyl)-2-methylpropan-2-yl)-5((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanamide

CAS-No. 2808072-95-7

Formula C 20 H29 N3 O 3 S Mol. weight 391,53 g/mol

LS-4030

Biotin-Ahx-Ahx-Tyramide

CAS-No. 851113-28-5

Formula C 30 H47N 5 O 5 S Mol. weight 589,8 g/mol

LS-4000 Biotin-Dde-Tyramide

2-(1-(4-hydroxyphenethylamino)-5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentylidene)-5,5-dimethylcyclohexane-1,3-dione

CAS-No. 2819732-80-2

Formula C 26 H35N3 O4 S Mol. weight 485,64 g/mol

PEG8130 Biotin-PEG(4)-Dde-Tyramide

N-(15-(4,4-dimethyl-2,6-dioxocyclohexylidene)-18-(4hydroxyphenyl)-3,6,9,12-tetraoxa-16-azaoctadecyl)5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d] imidazol-4-yl)pentanamide

CAS-No. 2814457-48-0

Formula C 34H 56 N4O 9 S Mol. weight 732,93 g/mol

References:

→ New insights into the DT40 B cell receptor cluster using a proteomic proximity labeling assay; X. W. Li, J. S. Rees, P. Xue, H. Zhang, S. W. Hamaia, B. Sanderson, P. E. Funk, R. W. Farndale, K. S. Lilley, S. Perrett,A. P. Jackson; J Biol Chem 2014; 289: 14434-47. arrow-up-right-from-square https://doi.org/10.1074/jbc.M113.529578

→ Proteomic mapping of mitochondria in living cells via spatially restricted enzymatic tagging; H. W. Rhee, P. Zou, N. D. Udeshi, J. D. Martell, V. K. Mootha, S. A. Carr, A. Y. Ting; Science 2013; 339: 1328-1331. arrow-up-right-from-square https://doi.org/10.1126/science.1230593

→ A catalysis-based selection for peroxidase antibodies with increased activity; J. Yin, J. H. Mills, P. G. Schultz; J Am Chem Soc 2004; 126: 3006-7. arrow-up-right-from-square https://doi.org/10.1021/ja039198o

→ Catalyzed reporter deposition, a novel method of signal amplification. II. Application to membrane immunoassays; M. N. Bobrow, K. J. Shaughnessy, G. J. Litt; J Immunol Methods 1991; 137: 103-12. arrow-up-right-from-square https://doi.org/10.1016/0022-1759(91)90399-z arrow-up

Biotinylation Reagents

→ Catalyzed reporter deposition, a novel method of signal amplification. Application to immunoassays; M. N. Bobrow, T. D. Harris, K. J. Shaughnessy, G. J. Litt; J Immunol Methods 1989; 125: 279-85. arrow-up-right-from-square https://doi.org/10.1016/0022-1759(89)90104-x

→ The Oxidation of Tyramine, Tyrosine, and Related Compounds by Peroxidase; A. J. Gross, I. W. Sizer; J. Biol. Chem. 1959; 234: 1611-1614.

→ WO2008128352 A1.

HRP fusion protein biotin-AEEA-phenol

biotinylation

cell lysis and purification of biotinylated proteins using streptavidin analysis

Fig. 5: Principle of proximity labeling of cell-surface proteins with biotin-AEEA-tyramide.

Hydrophilic biotin-AEEA-tyramide, which bears a short PEG spacer between the biotin and the phenol moieties, is shown to be a membrane-impermeant variant of regular biotin-tyramide when used for a short time on cultured cells (ca. 1 min during the biotinylation reaction). Biotin-AEEA-tyramide can thus be used for the selective biotinylation of cell surface proteins.

LS-3490 Biotin-AEEA-Tyramide

N-(2-(2-(2-(4-hydroxyphenethylamino)-2-oxoethoxy) ethoxy)ethyl)-5-((3aS,4S,6aR)-2-oxohexahydro-1Hthieno[3,4-d]imidazol-4-yl)pentanamide

CAS-No. 2561473-92-3

Formula C 24H36 N4O 6 S Mol. weight 508,63 g/mol

Reference:

→ Mapping the Proteome of the Synaptic Cleft through Proximity Labeling Reveals New Cleft Proteins; T. Cijsouw, A. Ramsey, T. Lam, B. Carbone, T. Blanpied, T. Biederer; Proteomes 2018; 6: 48. arrow-up-right-from-square https://doi.org/10.3390/proteomes6040048

Proximity labeling of proteins with biotin-phenol (biotin-tyramide) and an engineered peroxidase enzyme (e.g., APEX = Engineered Ascorbate Peroxidase) is a pivotal tool for molecular biology. So far, mainly phenolic compounds have been used as substrates for APEX enzymes. The enzymatic reaction yields phenoxyl radicals that predominantly react with electron-rich amino acid side-chains. Consequently, phenolic compounds conjugated to biotin are not ideal for the biotinylation of nucleic acids. In order to facilitate the efficient labeling of nucleic acids, arylamine-biotin conjugates were developed (Zhou et al., Angew. Chem. Int. Ed. 2019). These novel probes show a significantly higher reactivity towards nucleic acids compared to biotin-phenol. In combination with the peroxidase APEX2, these probes allow for the mapping of the subcellular transcriptome by proximity-dependent labeling in living cells, and may aid in elucidating the subcellular organization of biomolecules. When combined with RNA sequencing (APEXseq), this labeling method provides complete sequence information for various classes of RNA with a high spatiotemporal resolution (Fazal & Han et al., Cell 2019).

extracellular matrix

GPI anchored protein = APEX

N-glycosylated membrane protein

glycosphingolipid

PPEtn

transmembrane receptor

Fig. 6: APEX2 can be genetically coded to the cellular region of interest, where biotin-aniline allows for a biotinylation of RNA with high spatiotemporal resolution.

Biotinylation Reagents

LS-3970 Biotin-aniline

N-(4-aminophenethyl)-biotinamide

CAS-No. 769933-15-5

Formula C18 H26 N4O 2 S Mol. weight 362,49 g/mol

LS-4650 Biotin-naphthylamine

N-(3-(5-aminonaphthalen-1-yl)propyl)-D-biotinamide

CAS-No. 2375201-60-6

Formula C 23 H30 N4O 2 S Mol. weight 426,58 g/mol

References:

→ Atlas of Subcellular RNA Localization Revealed by APEX-Seq; F. M. Fazal, S. Han, K. R. Parker, P. Kaewsapsak, J. Xu, A. N. Boettiger, H. Y. Chang, A. Y. Ting; Cell 2019; 178: 473-490 e26. arrow-up-right-from-square https://doi.org/10.1016/j.cell.2019.05.027

→ Directed evolution of APEX2 for electron microscopy and proximity labeling; S. S. Lam, J. D. Martell, K. J. Kamer, T. J. Deerinck, M. H. Ellisman, V. K. Mootha, A. Y. Ting; Nat Methods 2015; 12: 51-4. arrow-up-right-from-square https://doi.org/10.1038/nmeth.3179

SNAP-tag® and CLIP-tagTM

Biotin-conjugated benzylguanine (BG) reacts specifically and rapidly with the so-called SNAP-tag®, a polypeptide protein tag, allowing irreversible and covalent labeling of SNAP fusion proteins with biotin. Biotinylated proteins can for example be selectively isolated based on the high affinity towards (strept) avidin representing a useful tool for purification, immobilization, and labeling.

Fig. 7: The SNAP-tag® is a 20 kDa self-labeling protein tag based on a modified form of the human O6-alkylguanine-DNA-alkyltransferase (hAGT), a DNA repair enzyme. A cysteine residue within the SNAP-tag® undergoes an irreversible reaction with synthetic O6-benzylguanine (BG) derivatives resulting in a covalent thioether bond. The BG moiety can easily be further functionalized with a label of choice, e.g., fluorophore, biotin, generally without affecting the reaction of the substrate with the SNAP-tag®.

RL-3860 Biotin-SNAP

N-(4-(((2-amino-9H-purin-6-yl)oxy)methyl)benzyl)6-(5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d] imidazol-4-yl)pentanamido)hexanamide

CAS-No. 471918-16-8

Formula C 29 H39 N9 O4 S Mol. weight 609,75 g/mol

References:

→ SNAP-Tag Technology: A Useful Tool To Determine Affinity Constants and Other Functional Parameters of Novel Antibody Fragments; J. Niesen, M. Sack, M. Seidel, R. Fendel, S. Barth, R. Fischer, C. Stein; Bioconjug Chem 2016; 27: 1931-41. arrow-up-right-from-square https://doi.org/10.1021/acs.bioconjchem.6b00315

→ Site-specific, covalent labeling of recombinant antibody fragments via fusion to an engineered version of 6-O-alkylguanine DNA alkyltransferase; F. Kampmeier, M. Ribbert, T. Nachreiner, S. Dembski, F. Beaufils, A. Brecht, S. Barth; Bioconjug Chem 2009; 20: 1010-5. arrow-up-right-from-square https://doi.org/10.1021/bc9000257

→ A general method for the covalent labeling of fusion proteins with small molecules in vivo; A. Keppler, S. Gendreizig, T. Gronemeyer, H. Pick, H. Vogel, K. Johnsson; Nat Biotechnol 2003; 21: 86-9. arrow-up-right-from-square https://doi.org/10.1038/nbt765

→ Directed Evolution of O6-Alkylguanine-DNA Alkyltransferase for Efficient Labeling of Fusion Proteins with Small Molecules In Vivo; A. Juillerat, T. Gronemeyer, A. Keppler, S. Gendreizig, H. Pick, H. Vogel, K. Johnsson; Chem. Biol. 2003; 10: 313-317. arrow-up-right-from-square https://doi.org/10.1016/s1074-5521(03)00068-1

Biotin-conjugated benzylcytosine (BC) reacts specifically and rapidly with the so-called CLIP-tagTM , a polypeptide protein tag, allowing irreversible and covalent labeling of clip fusion proteins with biotin. Biotinylated proteins can for example be selectively isolated based on the high affinity towards (strept) avidin representing a useful tool for purification, immobilization, and labeling.

Fig. 8: The CLIP-tagTM (20 kDa) is a modified version of the SNAP-tag®, engineered to react with benzylcytosine (BC) instead of benzylguanine (BG). Thus, properties are similar. CLIP-tagTM- and SNAP-tag®fused proteins can be labeled simultaneously in the same cells.

SNAP-tag® is a registered trademark and CLIP-tagTM a trademark of New England Biolabs. His Tag® is a registered trademark of Merck KGAA.

Biotinylation Reagents

RL-3870 Biotin-Clip

N-(4-(((4-aminopyrimidin-2-yl)oxy)methyl)benzyl)6-(5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d] imidazol-4-yl)pentanamido)hexanamide

CAS-No. 1004524-73-5

Formula C 28 H39 N7 O4 S Mol. weight 569,73 g/mol

Reference:

Product details

His-tag

This 4-methoxyphenyl ester adds selectively to Gly-His-tags of proteins, while it does not react with amino functions of surface accessible lysines. Therefore, it expresses a unique possibility to label proteins regiospecifically at the Gly-His-tag position, enabling a wide application field in chemical biology and for biopharmaceuticals.

Product details

RL-3100 Biotin-AEEA-OPhOMe

2-(2-(2-(Biotinamido)ethoxy)ethoxy)acetic acid 4-methoxyphenyl ester

CAS-No. 2546513-67-9

Formula C 23 H33 N3 O 7S Mol. weight 495,59 g/mol

For more details about the methodology for highly selective N-terminal chemical acylation of expressed proteins, please look at our blog at: www.iris-biotech.de/blog/potm-his-tags-for-the-chemical-modification-of-peptides/

References:

→ Selective N-terminal acylation of peptides and proteins with a Gly-His tag sequence; M. C. Martos-Maldonado, C. T. Hjuler, K. K. Sorensen, M. B. Thygesen, J. E. Rasmussen, K. Villadsen, S. R. Midtgaard, S. Kol, S. Schoffelen, K. J. Jensen; Nat Commun 2018; 9: 3307. arrow-up-right-from-square https://doi.org/10.1038/s41467-018-05695-3

→ Selective Acylation of Proteins at Gly and Lys in His Tags; K. J. Jensen, M. B. Thygesen, K. K. Sørensen, S. Wu, T. Treiberg, S. Schoffelen; ChemBioChem 2022; 23(24): e202200359. arrow-up-right-from-square https://doi.org/10.1002/cbic.202200359

Another way for site-selective conjugation is the so-called π-Clamp-mediated cysteine conjugation. Pentelute and co-workers showed that the incorporation of the four-amino-acid sequence Phe-Cys-ProPhe, the so-called „π-Clamp“, tunes the reactivity of this cysteine thiol for site-selective conjugation with perfluoroaromatic reagents. Thus, this technology can be used to selectively modify one cysteine site in proteins containing multiple endogenous cysteine residues.

RL-4050 PFB-mercaptopropionyl-TOTA-Biotin

Perfluorobiphenyl-mercaptopropionyl-TOTA-Biotin F F

Formula C 35H41F9 N4O 6 S 2

Mol. weight 848,84 g/mol

References:

→ Enzymatic „click“ ligation: selective cysteine modification in polypeptides enabled by promiscuous glutathione S-transferase; C. Zhang, A. M. Spokoyny, Y. Zou, M. D. Simon, B. L. Pentelute; Angew Chem Int Ed Engl. 2013; 52(52) : 14001-5. arrow-up-right-from-square https://doi.org/10.1002/anie.201306430

→ Convergent diversity-oriented side-chain macrocyclization scan for unprotected polypeptides; Y. Zou, A. M. Spokoyny, C. Zhang, M. D. Simon, H. Yu, Y.-S. Lin, B. L. Pentelute; Org. Biomol. Chem. 2014; 12: 566-573. arrow-up-right-from-square https://doi.org/10.1039/C3OB42168F

→ π-Clamp-mediated cysteine conjugation; C. Zhang, M. Welborn, T. Zhu, N. J. Yang, M. S. Santos, T. Van Voorhis, B. L. Pentelute; Nat Chem. 2016; 8: 120-128. arrow-up-right-from-square https://doi.org/10.1038/nchem.2413

→ Site-Specific Small Molecule Labeling of an Internal Loop in JC Polyomavirus Pentamers Using the π-ClampMediated Cysteine Conjugation; J. A. Baccile, P. J. Voorhees, A. J. Chillo, M. Berry, R. Morgenstern, T. J. Schwertfeger, F. M. Rossi, C. D. S. Nelson; ChemBioChem 2022; (21): 3037-3041. arrow-up-right-from-square https://doi.org/10.1002/cbic.202100188

CBT Derivatives

Fig. 9: Mechanism of the CBT-Click reaction: The electron pair of the sulfur attacks the carbon of the cyano group, the nitrogen forms an enamine. The cysteine’s nitrogen then attacks the carbon of the enamine, and a cyclic intermediate is formed. Finally, the lone electron pair of the amino nitrogen of the cysteine attacks the positively charged carbon to yield the product. The nitrogen which came from the nitrile is leaving the reaction as ammonia.

Biotinylation Reagents

RL-4230 Biotin-Gly-CBT

N-(2-((2-cyanobenzo[d]thiazol-6-yl)amino)-2-oxoethyl)biotin

Formula C 20 H22N 6 O 3 S 2 Mol. weight 458,56 g/mol

RL-4240 Biotin-Pen-CBT

N-(5-((2-cyano-6-benzothiazolyl)amino)-5-oxopentyl)biotin

CAS-No. 2550397-17-4

Formula C 23 H28 N 6 O 3 S 2 Mol. weight 500,64 g/mol

RL-4250 Biotin-PEG(4)-Gly-CBT

15-Biotinylamino-4,7,10,13-tetraoxa-pentadecanoyl-glycinyl-N-2-cyano-benzothiazole

CAS-No. 1907639-46-6

Formula C 31H43 N7 O 8 S 2 Mol. weight 705,85 g/mol . circle-arrow-right You could not find the product you are looking for?

Please contact us for a custom synthesis!

5. Reversible Biotinylation

Competitive Displacement of Desthiobiotin or 2-Iminobiotin by Biotin

The single-ring, sulfur-free desthiobiotin binds to (strept)avidin with almost the same specificity as biotin but has a lower affinity than biotin (K d =10-11 M vs. K d =10-15 M, respectively). Thus, milder elution conditions based on competitive displacement with free biotin are sufficient for the efficient release of desthiobiotinylated proteins from (strept)avidin. In addition, as further advantage, endogenous biotinylated molecules remain bound to (strept)avidin during pull-down assay experiments with biological samples, which allows easy differentiation and prevents co-purification.

In comparison to biotin and desthiobiotin, the guanidino analog of biotin (= 2-iminobiotin) shows an even weaker binding affinity for (strept)avidin, which is, in addition, pH-dependent. At high pH (> 9), iminobiotin-tagged proteins bind to (strept)avidin conjugates with high affinity, but the (strept)avidin–iminobiotin complexes dissociate at low pH (~ 4) or via replacement upon addition of biotin. This allows the purification of a captured protein without denaturation, releasing biologically functional, 2-iminobiotinylated-proteins from the (strept)avidin conjugates. Besides, 2-iminobiotin reversibly inhibits nitric oxide synthases (NOS). NOS oxidizes the guanidino-nitrogen of L-arginine, resulting in L-citrulline and nitric oxide.

Tab.1: Overview of different biotin derivatives and affinity towards (strept)avidin.

Compound Biotin

Affinity towards (strept)avidin (Kd)

LS-1070 D-Biotin

Hexahydro-2-oxo-1H-thieno[3,4-d]imidazole-4-pentanoic acid

CAS-No. 58-85-5

Formula C10 H16 N2O 3 S Mol. weight 244,31 g/mol

LS-1650 D-Desthiobiotin

(4R,5S)-5-methyl-2-oxo-4-Imidazolidinehexanoic acid

CAS-No. 533-48-2

Formula C10 H18 N2O 3

Mol. weight 214,27 g/mol

Desthiobiotin

2-Iminobiotin

Biotinylation Reagents

LS-4320 2-Iminobiotin

5-((4S)-2-iminohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanoic acid

CAS-No. 13395-35-2

Formula C10 H17N3 O 2 S

Mol. weight 243,32 g/mol

References:

→ Iminobiotin affinity columns and their application to retrieval of streptavidin; K. Hofmann, S. W. Wood, C. C. Brinton, J. A. Montibeller, F. M. Finn; Proc Natl Acad Sci U S A 1980; 77: 4666-8. arrow-up-right-from-square https://doi.org/10.1073/pnas.77.8.4666

→ Voltammetric homogeneous binding assay of biotin without a separation step using iminobiotin labeled with an electroactive compound; K. Sugawara, N. Kamiya, G. Hirabayashi, H. Kuramitz; Anal. Sci. 2005; 21: 897-900. arrow-up-right-from-square https://doi.org/10.2116/analsci.21.897

→ Easily reversible desthiobiotin binding to streptavidin, avidin, and other biotin-binding proteins: uses for protein labeling, detection, and isolation; J. D. Hirsch, L. Eslamizar, B. J. Filanoski, N. Malekzadeh, R. P. Haugland, J. M. Beechem, R. P. Haugland; Anal Biochem 2002; 308 : 343-57. arrow-up-right-from-square https://doi.org/10.1016/s0003-2697(02)00201-4

→ The use of the 2-iminobiotin-avidin interaction for the selective retrieval of labeled plasma membrane components; G. A. Orr; J. Biol. Chem. 1981; 256: 761-766. arrow-up-right-from-square https://doi.org/10.1016/s0021-9258(19)70041-6

Dde-based Linkers

Placing Dde as one terminal group of a linker and a functional group prone for conjugation as the other, or using Dde as the central connective portion of a linker, allows for the creation of new bifunctional and cleavable linkers. Dde can be selectively cleaved by using a buffered, aqueous solution of hydrazine or hydroxylamine, thus cleaving the linkage after (strept)avidin attachment. The cleavage can be monitored spectroscopically, as the resulting pyrazole shows a strong absorption at 290 nm.

Fig. 10: Cleavage of Dde-based linkers by (buffered) solutions of hydrazine or hydroxylamine can spectroscopically be monitored due to the formation of a chromophoric pyrazole derivative.

LS-4020 Biotin-Dde

2-(1-hydroxy-5-((3aS,4S,6aR)-2-oxohexahydro-1Hthieno[3,4-d]imidazol-4-yl)pentylidene)-5,5-dimethylcyclohexane-1,3-dione

CAS-No. 194038-08-9

Formula C18 H26 N2O4 S

Mol. weight 366,48 g/mol

Dde-based linkers can selectively and temporarily be attached to:

biomolecules for binding to (strept)avidin (with terminal biotin) (A); conjugation to any solid supports, e.g., via Click reaction (B); solubilizing tags, e.g., hexa-lysine (C) or oligo-arginine; PEGs (D) or other hydrophilic groups improving the solubility;

• dyes and any other conjugate for monitoring, diagnostics, targeting or other purposes.

Fig. 11: Dde-based linkers can be utilized for various applications: Attachment of a cleavable biotin tag to proteins for catch-and-release affinity purification over (strept)avidin beads (A), reversible labeling or conjugation to other biomolecules, or reversible immobilization on solid supports via Click chemistry (B), temporary attachment of solubilizing tags like oligo-lysine (C) or PEGs (D).

Dde-based linkers are one option of cleavable linkers with mild cleavage conditions. A different widely applicable methodology is the introduction of disulfides. Biotinylating variants with cleavable linkers based on disulfides can be cleaved using reducing agents such as glutathione. Alternatively, reducing conditions inside certain cell compartments enable specific elution of biotinylated molecules from biotin-binding proteins.

Biotinylation Reagents

References:

→ Chemical synthesis of Shiga toxin subunit B using a next-generation traceless „helping hand“ solubilizing tag; J. M. Fulcher, M. E. Petersen, R. J. Giesler, Z. S. Cruz, D. M. Eckert, J. N. Francis, E. M. Kawamoto, M. T. Jacobsen, M. S. Kay; Org Biomol Chem 2019; 17: 10237-10244. arrow-up-right-from-square https://doi.org/10.1039/c9ob02012h

→ Synthesis of hydrophobic insulin-based peptides using a helping hand strategy; M. M. Disotuar, M. E. Petersen, J. M. Nogueira, M. S. Kay, D. H. Chou; Org Biomol Chem 2019; 17: 1703-1708. arrow-up-right-from-square https://doi.org/10.1039/c8ob01212a

→ Mapping the Binding Site of BMS-708163 on gamma-Secretase with Cleavable Photoprobes; N. Gertsik, C. W. Am Ende, K. F. Geoghegan, C. Nguyen, P. Mukherjee, S. Mente, U. Seneviratne, D. S. Johnson, Y. M. Li; Cell Chem Biol 2017; 24: 3-8. arrow-up-right-from-square https://doi.org/10.1016/j.chembiol.2016.12.006

→ A Helping Hand to Overcome Solubility Challenges in Chemical Protein Synthesis; M. T. Jacobsen, M. E. Petersen, X. Ye, M. Galibert, G. H. Lorimer, V. Aucagne, M. S. Kay; J Am Chem Soc 2016; 138: 11775-82. arrow-up-right-from-square https://doi.org/10.1021/jacs.6b05719

→ Cleavable trifunctional biotin reagents for protein labelling, capture and release; Y. Yang, S. H. Verhelst; Chem Commun (Camb) 2013; 49: 5366-8. arrow-up-right-from-square https://doi.org/10.1039/c3cc42076k

→ Full orthogonality between Dde and Fmoc: the direct synthesis of PNA-peptide conjugates; J. J. Diaz-Mochon, L. Bialy, M. Bradley; Org Lett 2004; 6: 1127-9. arrow-up-right-from-square https://doi.org/10.1021/ol049905y

→ Investigation on the stability of the Dde protecting group used in peptide synthesis: migration to an unprotected lysine; K. Augustyns, W. Kraas, G. Jung; J Pept Res 1998; 51: 127-33. arrow-up-right-from-square https://doi.org/10.1111/j.1399-3011.1998.tb00630.x

→ Compounds and methods for purifying peptides produced by solid phase peptide synthesis; V. Aucagne, A. Delmas.; CNRS; U.S. Patent No. 9,073,969, 2015.

. circle-arrow-right

Find more linkers and background on self-immolative linker technologies in our booklet Linkerology®!

Biotin-SS-NHS is a disulfide bridge-containing biotinylation construct that can be cleaved using reducing agents such as glutathione or by reducing conditions inside certain cell compartments.

HRP-labeled antibody

biotinylation

purification using streptavidin reduction of disulfide bond analysis

Fig. 12: Targeted biotinylation and purification of cell-surface proteins.

RL-3300 Biotin-SS-COOH

3-((2-(5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d] imidazol-4-yl)pentanamido)ethyl)disulfanyl)propanoic acid

CAS-No. 104582-29-8

Formula C15H25N3 O4 S 3 Mol. weight 407,57 g/mol

Biotinylation Reagents

PEG8090 Biotin-PEG(4)-SS-COOH

9,25-dioxo-29-((3aS,4S,6aR)-2-oxohexahydro-1Hthieno[3,4-d]imidazol-4-yl)-12,15,18,21-tetraoxa-4,5-dithia-8,24-diazanonacosan-1-oic acid

CAS-No. 1380166-80-2

Formula C 26 H46 N4O 9 S 3

Mol. weight 654,86 g/mol

PEG1910

Biotin-PEG(4)-S-S-NHS

1-Biotinamino-15-oxo-3,6,9,12-tetraoxa-19,20-dithia-16-azatricosan-23-oic acid succinimidyl ester

CAS-No. 1260247-51-5

Formula C 30 H49 N 5 O 11 S 3

Mol. weight 751,93 g/mol

Product details

Biotin-SS-tyramide is a valuable linker for peroxidase-promoted targeted protein biotinylation and protein clusters on cell surfaces. By using peroxidase-tagged antibodies, proteins and protein clusters can be selectively biotinylated, and then isolated using (strept)avidin. The biotin-tag can be subsequently removed using reducing agents (e.g., glutathione). One possible application of biotin-SS-tyramide is the targeted biotinylation of proteins and protein clusters on cell surfaces using HRP-labeled antibodies. Labeled proteins are then purified by using (strept)avidin and released by reductive cleavage of the linker disulfide bond. Product details

LS-3570

Biotin-SS-Tyramide

N-(2-((3-(4-hydroxyphenethylamino)-3-oxopropyl) disulfanyl)ethyl)-5-(2-oxohexahydro-1H-thieno[3,4-d] imidazol-4-yl)pentanamide

CAS-No. 678975-20-7

Formula C 23 H34N4O4 S 3 Mol. weight 526,74 g/mol

LS-3930 Biotin-PEG(4)-SS-Tyramide

N-(2-((3-(4-hydroxyphenethylamino)-3-oxopropyl)disulfanyl)ethyl)-1-(5-(2-oxohexahydro-1H-thieno[3,4-d] imidazol-4-yl)pentanamido)-3,6,9,12-tetraoxapentadecan-15-amide

Formula C 34H 55N 5 O 9 S 3

Mol. weight 774,02 g/mol

References:

→ New insights into the DT40 B cell receptor cluster using a proteomic proximity labeling assay; X. W. Li, J. S. Rees, P. Xue, H. Zhang, S. W. Hamaia, B. Sanderson, P. E. Funk, R. W. Farndale, K. S. Lilley, S. Perrett, A. P. Jackson; J Biol Chem 2014; 289: 14434-47. arrow-up-right-from-square https://doi.org/10.1074/jbc.M113.529578

→ A novel tandem affinity purification strategy for the efficient isolation and characterisation of native protein complexes; C. J. Gloeckner, K. Boldt, A. Schumacher, R. Roepman, M. Ueffing; Proteomics 2007; 7: 4228-34. arrow-up-right-from-square https://doi.org/10.1002/pmic.200700038

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Biotinylation Reagents

6. Sulfhydryl-Reactive Biotinylation Reagents

Besides amines, sulfhydryl groups of cysteines are the second most-common targets for biotinylation. Maleimide groups are highly reactive towards sulfhydryl groups at acidic to neutral pH, forming a thioether bond. Alternatively, thiols and pyridyl disulfide-substituted biotin derivatives can be used, resulting in the formation of a cleavable disulfide bond. In the case of using pyridyldisulfides, the biotinylation reaction can visually be monitored by the release of pyridine-2-thione.

Biotin Reagents with Maleimide Function

LS-4220

Biotin-mal

N-(2-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)ethyl)-5((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanamide

CAS-No. 139554-72-6

Formula C16 H22N4O4 S Mol. weight 366,44 g/mol

RL-8420 Biotin-NH-NH-Mal

6-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)-N‘-(5((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanoyl)hexanehydrazide

CAS-No. 116919-18-7

Formula C 20 H29 N 5 O 5 S Mol. weight 451,54 g/mol

PEG1605

Biotin-PEG(3)-mal

N-(3-(2-(2-(3-(Biotinamino)propoxy)ethoxy)ethoxy) propyl)-3-maleimidylpropanamide

CAS-No. 525573-22-2

Formula C 27H43 N 5 O 8 S Mol. weight 597,72 g/mol

PEG1595

Biotin-PEG(11)-mal

alpha-Biotin-omega-maleimido undeca(ethylene glycol)

CAS-No. 1334172-60-9

Formula C 41H71N 5 O 16 S Mol. weight 922,09 g/mol

Product details

PEG4320

Biotin-PEG(23)-mal

alpha-Biotin-omega-maleimido 23(ethylene glycol)

CAS-No. 1334172-60-9

Formula C 65H119 N 5 O 28 S Mol. weight 1450,72 g/mol

PEG1049

Biotin-PEG-mal (3 kDa)

alpha-Biotin-omega-maleimido poly(ethylene glycol)

Mol. weight 3000 Da

PEG1050 Biotin-PEG-mal (5 kDa)

alpha-Biotin-omega-maleimido poly(ethylene glycol)

Mol. weight 5000 Da

PEG1048 Biotin-PEG-mal (10 kDa)

alpha-Biotin-omega-maleimido poly(ethylene glycol)

Mol. weight 10000 Da

RL-8425 Biocytin-Mal

N2-(3-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)propanoyl)N6-(5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d] imidazol-4-yl)pentanoyl)-L-lysine

CAS-No. 102849-12-7

Formula C 23 H33 N 5 O 7S Mol. weight 523,61 g/mol

Biotinylation Reagents

Biotin Reagents with Thiol Function

LS-4250

Biotin-Cysteamine

N-(2-mercaptoethyl)-5-((3aS,4S,6aR)-2-oxohexahydro1H-thieno[3,4-d]imidazol-4-yl)pentanamide

CAS-No. 99938-68-8

Formula C12H21N3 O 2 S 2 Mol. weight 303,44 g/mol

LS-4260

Biotin-PEG(3)-SH

N-(17-mercapto-15-oxo-4,7,10-trioxa-14-azaheptadecyl)-5-((3aS,4S,6aR)-2-oxohexahydro-1Hthieno[3,4-d]imidazol-4-yl)pentanamide

CAS-No. 1208242-09-4

Formula C 23 H42N4O 6 S 2 Mol. weight 534,73 g/mol

PEG4705

Biotin-PEG(11)-SH

alpha-Biotin-omega-mercapto undeca(ethylene glycol)

CAS-No. 1650579-23-9

Formula C 34H 65N3 O 13 S 2 Mol. weight 788,02 g/mol

PEG1213

Biotin-PEG-SH (3 kDa)

alpha-Biotin-omega-mercapto poly(ethylene glycol)

CAS-No. 1030917-83-9 Mol. weight 3000 Da

PEG1214

Biotin-PEG-SH (5 kDa)

alpha-Biotin-omega-mercapto poly(ethylene glycol)

CAS-No. 1030917-83-9 Mol. weight 5000 Da

PEG1212

Biotin-PEG-SH (10 kDa)

alpha-Biotin-omega-mercapto poly(ethylene glycol)

CAS-No. 1030917-83-9

Mol. weight 10000 Da

PEG3570

Lipoamide-PEG(3)-biotin

alpha-Lipoamide-omega-biotinyl tri(ethylene glycol)

CAS-No. 1334172-74-5

Formula C 28 H 50 N4O 6 S 3

Mol. weight 634,91 g/mol

PEG3580

Lipoamide-PEG(11)-biotin

alpha-Lipoamide-omega-biotinyl undeca(ethylene glycol)

CAS-No. 960069-81-2

Formula C 42H78 N4O 14 S 3 Mol. weight 959,28 g/mol

PEG7530 Lipoamide-PEG(23)-biotin

alpha-Lipoamide-omega-biotinyl 23(ethylene glycol)

Formula C 66 H126 N4O 26 S 3 Mol. weight 1487,91 g/mol

Biotin Reagents with Cleavable Disulfide Unit

LS-4230 Biotin-SS-Py

5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d] imidazol-4-yl)-N-(2-(pyridin-2-yldisulfaneyl)ethyl) pentanamide

CAS-No. 112247-65-1

Formula C17H24N4O 2 S 3 Mol. weight 412,59 g/mol

Biotinylation Reagents

RL-8415

Biotin-Hx-SS-Py

5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)-N-(6-(3-(pyridin-2-yldisulfanyl)propanamido) hexyl)pentanamide

CAS-No. 129179-83-5

Formula C 24H37N 5 O 3 S 3 Mol. weight 539,77 g/mol

LS-4240

Biotin-PEG(3)-SS-Py

N-(15-oxo-17-(pyridin-2-yldisulfaneyl)-4,7,10-trioxa-14azaheptadecyl)-5-((3aS,4S,6aR)-2-oxohexahydro-1Hthieno[3,4-d]imidazol-4-yl)pentanamide

Formula C 28 H45N 5 O 6 S 3 Mol. weight 643,88 g/mol

PEG4770

Biotin-PEG-OPSS (3 kDa)

alpha-Biotin-omega-pyridyl-2-disulfid poly(ethylene glycol)

CAS-No. 1776111-43-3 Mol. weight 3000 Da

PEG4775

Biotin-PEG-OPSS (5 kDa)

alpha-Biotin-omega-pyridyl-2-disulfid poly(ethylene glycol)

CAS-No. 1776111-43-3 Mol. weight 5000 Da

PEG4780

Biotin-PEG-OPSS (10 kDa)

alpha-Biotin-omega-pyridyl-2-disulfid poly(ethylene glycol)

CAS-No. 1776111-43-3 Mol. weight 10000 Da

PEG4785

Biotin-PEG-OPSS (20 kDa)

alpha-Biotin-omega-pyridyl-2-disulfid poly(ethylene glycol)

CAS-No. 1776111-43-3 Mol. weight 20000 Da

7. Click-Reactive Biotinylation Reagents

Our portfolio includes azide- as well as alkyne-derivatized biotins suitable for conjugation via click chemistry. As further benefit triazole-linked adducts are shown to be highly resistant to the ubiquitous hydrolytic enzyme biotinidase and to bind (strept)avidin with dissociation constants in the low pM range.

Product details

LS-4300 DecarboxyBiotin-N3

(3aS,4S,6aR)- 4-(5-Azidopentyl)tetrahydro-1H-Thieno[3,4-d]imidazol-2(3H)-one

CAS-No. 1260586-88-6

Formula C10 H17N 5 OS Mol. weight 255,34 g/mol

LS-4210 Biotin-N3

N-(3-azidopropyl)-5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanamide

CAS-No. 908007-17-0

Formula C13 H22N 6 O 2 S Mol. weight 326,42 g/mol

LS-4660 Biotinyl-DAPe-N3

N-(5-azidopentyl)-5-((3aS,4S,6aR)-2-oxohexahydro-1Hthieno[3,4-d]imidazol-4-yl)pentanamide

CAS-No. 1349190-76-6

Formula C15H26 N 6 O 2 S Mol. weight 354,47 g/mol

PEG6795 Biotin-PEG3-Ph(4-N3)

Biotin-PEG3-phenyl azide

CAS-No. 2088238-77-9

Formula C 25H37N7 O 6 S Mol. weight 563,67 g/mol

Biotinylation Reagents

LS-4680

Biotin-PEG(3)-PyAz

6-(azidomethyl)-N-(13-oxo-17-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)-3,6,9-trioxa-12-azaheptadecyl)nicotinamide

Formula C 25H38 N 8 O 6 S Mol. weight 578,69 g/mol

PEG4940

Biotin-PEG(3)-N3

11-[D(+)-Biotinylamino]-1-azido-3,6,9-trioxaundecane

CAS-No. 875770-34-6

Formula C18 H32N 6 O 5 S Mol. weight 444,55 g/mol

PEG7990

Biotin-PEG(4)-N3

(3aS,4S,6aR)-4-(28-azido-5,21-dioxo-9,12,15,18-tetraoxa-6,22-diazaoctacosyl)tetrahydro-1H-thieno[3,4-d]imidazol-2(3H)-one

CAS-No. 1006592-62-6

Formula C 27H49 N7 O 7S Mol. weight 615,79 g/mol

RL-4120 Biotin-SS-N3

N-(2-((2-azidoethyl)disulfanyl)ethyl)-5-((3aS,4S,6aR)-2oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanamide

CAS-No. 1620523-64-9

Formula C14H24N 6 O 2 S 3 Mol. weight 404,57 g/mol

PEG2065 Biotin-TEG-ATFBA

Biotin-triethylenglycol-( p-azido-tetrafluorobenzamide)

CAS-No. 1264662-85-2

Formula C 27H37F4N7 O 6 S Mol. weight 663,68 g/mol

PEG8000 Biotin-PEG(4)-Picolyl-N3

(3aS,4S,6aR)-4-(1-(6-(azidomethyl)pyridin-3-ylamino)1,17-dioxo-4,7,10,13-tetraoxa-16-azahenicosan-21-yl) tetrahydro-1H-thieno[3,4-d]imidazol-2(3H)-one

CAS-No. 2222687-71-8

Formula C 27H42N 8 O 7S

Mol. weight 622,74 g/mol

PEG8100

Biotin-PEG(4)-SS-Azide

N-(2-((3-((3-azidopropyl)amino)-3-oxopropyl)disulfaneyl)ethyl)-1-(5-((3aS,4S,6aR)-2-oxohexahydro-1Hthieno[3,4-d]imidazol-4-yl)pentanamido)-3,6,9,12-tetraoxapentadecan-15-amide

CAS-No. 1260247-52-6

Formula C 29 H 52N 8 O 8 S 3 Mol. weight 736,96 g/mol

PEG4330 Biotin-PEG(7)-N3

alpha-Biotin-omega-azido hepta(ethylene glycol)

CAS-No. 1334172-75-6

Formula C 26 H48 N 6 O 9 S Mol. weight 620,76 g/mol

PEG4340

Biotin-PEG(11)-N3

[2-(2-aminoethoxy)ethoxy]acetic acid tert-butyl ester*HCl

CAS-No. 956494-20-5

Formula C 34H 64N 6 O 13 S Mol. weight 796,97 g/mol

PEG4350 Biotin-PEG(23)-N3

alpha-Biotin-omega-azido 23(ethylene glycol)

CAS-No. 956494-20-5

Formula C 58 H112N 6 O 25 S Mol. weight 1325,6 g/mol

PEG7960 Biotin-PEG(4)-Dde-N3

N-(19-azido-15-(4,4-dimethyl-2,6-dioxocyclohexylidene)-3,6,9,12-tetraoxa-16-azanonadecyl)-5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanamide

CAS-No. 1802907-93-2

Formula C 32H 53 N7 O 8 S Mol. weight 695,87 g/mol

Biotinylation Reagents

PEG7970 Biotin-PEG(4)-Dde-Picolyl-N3

N-(6-(azidomethyl)pyridin-3-yl)-15-(4,4-dimethyl-2,6dioxocyclohexylidene)-1-(5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanamido)-3,6,9,12-tetraoxa-16-azanonadecan-19-amide

CAS-No. 2055048-42-3

Formula C 38 H 57N9 O 9 S Mol. weight 815,98 g/mol

LS-4280 Biotin-MeTz

N-(4-(6-methyl-1,2,4,5-tetrazin-3-yl)benzyl)-5((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanamide

CAS-No. 1802883-51-7

Formula C 20 H25N7 O 2 S Mol. weight 427,53 g/mol

LS-4290 Biotin-PEG(4)-MeTz

N-(4-(6-methyl-1,2,4,5-tetrazin-3-yl)benzyl)-1-(5((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d] imidazol-4-yl)pentanamido)-3,6,9,12-tetraoxapentadecan-15-amide

CAS-No. 1962919-31-8

Formula C 31H46 N 8 O 7S Mol. weight 674,82 g/mol

LS-4310 DecarboxyBiotin-Alkyne

(3aS,4S,6aR)- 4-(6-heptyn-1-yl)tetrahydro-1H-Thieno[3,4-d]imidazol-2(3H)-one

CAS-No. 887915-53-9

Formula C12H18 N2OS Mol. weight 238,35 g/mol

RL-3490 Biotin-Propargylamide

Biotinyl-N-propargylamide

CAS-No. 773888-45-2

Formula C13 H19 N3 O 2 S Mol. weight 281,37 g/mol

PEG6805

Biotin-PEG3-NH-Pentynoyl alpha-Biotin-omega-pentynoyl 3(ethylene glycol)

CAS-No. 869082-82-6

Formula C 23 H38 N4O 6 S Mol. weight 498,64 g/mol

PEG4950

Biotin-PEG(4)-alkyne

15-[D(+)-Biotinylamino]-4,7,10,13-tetraoxapentadec-1-yne

CAS-No. 1262681-31-1

Formula C 21H35N3 O 6 S Mol. weight 457,58 g/mol

PEG8010

Biotin-PEG(4)-Alkyne

(3aS,4S,6aR)-4-(5,21-dioxo-8,11,14,17-tetraoxa-4,20diazapentacos-1-yn-25-yl)tetrahydro-1H-thieno[3,4-d] imidazol-2(3H)-one

CAS-No. 1006592-45-5

Formula C 24H40 N4O 7S Mol. weight 528,66 g/mol

PEG8110

Biotin-PEG(4)-SS-Alkyne

N-(2-((3-oxo-3-(prop-2-ynylamino)propyl)disulfanyl)ethyl)-1-(5-((3aS,4S,6aR)-2-oxohexahydro-1Hthieno[3,4-d]imidazol-4-yl)pentanamido)-3,6,9,12-tetraoxapentadecan-15-amide

CAS-No. 1260247-54-8

Formula C 29 H49 N 5 O 8 S 3 Mol. weight 691,92 g/mol

PEG7980 Biotin-PEG(4)-Dde-Alkyne

N-(15-(4,4-dimethyl-2,6-dioxocyclohexylidene)-3,6,9,12tetraoxa-16-azanonadec-18-ynyl)-5-((3aS,4S,6aR)-2oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanamide

CAS-No. 1802908-00-4

Formula C 32H 50 N4O 8 S Mol. weight 650,83 g/mol

Biotinylation Reagents

LS-4270 Biotin-DBCO

(3aS,4S,6aR)-N-[3-(11,12-Didehydrodibenz[b,f] azocin-5(6H)-yl)-3-oxopropyl]hexahydro-2-oxo-1Hthieno[3,4-d]imidazole-4-pentanamide

CAS-No. 1418217-95-4

Formula C 28 H30 N4O 3 S Mol. weight 502,63 g/mol

RL-2520 Biotin-PEG(4)-DBCO

Dibenzoazacyclooctyne-tetra(ethylene glycol)-biotin

CAS-No. 1255942-07-4

Formula C 39 H 51N 5 O 8 S Mol. weight 749,92 g/mol

PEG8120 Biotin-PEG(4)-SS-DBCO

N-(2-((3-(3-(azadibenzocyclooctyn-1-yl)-3-oxopropylamino)-3-oxopropyl)disulfanyl)ethyl)-1-(5-((3aS,4S,6aR)2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanamido)-3,6,9,12-tetraoxapentadecan-15-am ide

Formula C 44H 60 N 6 O 9 S 3 Mol. weight 913,18 g/mol

PEG8140 Biotin-PEG(4)-Dde-DBCO

N-(15-(4,4-dimethyl-2,6-dioxocyclohexylidene)-19-oxo19-(azadibenzocyclooctyn-1-yl)-3,6,9,12-tetraoxa-16azanonadecyl)-5-((3aS,4S,6aR)-2-oxohexahydro-1Hthieno[3,4-d]imidazol-4-yl)pentanamide

CAS-No. 1807512-43-1

Formula C 47H 61N 5 O 9 S Mol. weight 872,08 g/mol

8. Biotinylated Amino Acids

Biocytin is a multi-purpose marker for neuroanatomical studies and the ideal substrate for biotinidase assays. Its strong complex formation with (strept)avidin conjugates opens up a broad range of detection methods. As biocytin is the natural substrate of the enzyme biotinidase, biocytin can be used to measure the biotinidase activity and therefore diagnose biotinidase deficiency. As an intermediate in the metabolism of biotin, biocytin occurs naturally in blood serum and urine.

Product details

LS-3510 Biocytin

N-epsilon-Biotinyl-L-Lysine

CAS-No. 576-19-2

Formula C16 H28 N4O4 S

Mol. weight 372,48 g/mol

Reference:

→ Improved neuronal tract tracing with stable biocytin-derived neuroimaging agents; A. Mishra, K. Dhingra, A. Schuz, N. K. Logothetis, S. Canals; ACS Chem Neurosci 2010; 1: 129-38. arrow-up-right-from-square https://doi.org/10.1021/cn900010d

For the introduction of biotin during peptide synthesis, biotinylated amino acid building blocks based on cysteine, glutamic acid, and lysine are available.

Product details

FAA3720 Fmoc-L-Cys(Biotin)-OH

N-alpha-(9-Fluorenylmethyloxycarbonyl)-S-biotinyl-L-cysteine

Formula C 28 H31N3 O 6 S 2 Mol. weight 569,69 g/mol

FAA8430 Fmoc-L-Glu(Biotin-TOTA)-OH

N-alpha-(9-Fluorenylmethyloxycarbonyl)-N-gamma-(N-biotinyl-3-(2-(2-(3-aminopropyloxy)ethoxy) ethoxy)propyl)-L-glutamine

CAS-No. 817169-73-6

Formula C 40 H 55N 5 O 10 S Mol. weight 797,96 g/mol

Biotinylation Reagents

HAA3430 H-L-Lys(Biotin)-NH2

N-epsilon-biotin-L-lysine amide

CAS-No. 61125-53-9

Formula C16 H29 N 5 O 3 S Mol. weight 371,50 g/mol

BAA1276 Boc-L-Lys(Biotin)-OH

N-alpha-t-Butyloxycarbonyl-N-epsilon-biotinyl-L-lysine

CAS-No. 62062-43-5

Formula C 21H36 N4O 6 S Mol. weight 472,6 g/mol

BAA1038 Boc-D-Lys(Biotin)-OH

N-alpha-t-Butyloxycarbonyl-N-epsilon-(Biotin)-D-lysine

CAS-No. 1272755-71-1

Formula C 21H36 N4O 6 S Mol. weight 472,61 g/mol

FAA1443 Fmoc-L-Lys(Biotin)-OH

N-alpha-(9-Fluorenylmethyloxycarbonyl)-N-epsilon-biotinyl-L-lysine

CAS-No. 146987-10-2

Formula C 31H38 N4O 6 S Mol. weight 594,7 g/mol

WAA5154 Fmoc-L-Lys(Biotin)-Wang Resin

Mesh Size 100-200 mesh DVB 1% DVB

FAA1451 Fmoc-D-Lys(Biotin)-OH

N-alpha-(9-Fluorenylmethyloxycarbonyl)-N-epsilon-biotinyl-D-lysine

CAS-No. 110990-09-5

Formula C 31H38 N4O 6 S Mol. weight 594,7 g/mol

FAA4670 Fmoc-L-Lys(Biotin-Ahx)-OH

N-alpha-(9-Fluorenylmethyloxycarbonyl)-N-epsilon-[6-(biotinylamino)hexanoyl]-L-lysine

CAS-No. 160158-05-4

Formula C 37H49 N 5 O 7S Mol. weight 707,88 g/mol

FAA8765 Fmoc-L-Lys(Biotin-Ahx-Ahx)-OH

N-alpha-(9-Fluorenylmethyloxycarbonyl)-N-epsilon-(biotinyl-biscaproyl)-L-lysine

Formula C 43 H 60 N 6 O 8 S Mol. weight 821,05 g/mol

PEG4440 Fmoc-L-Lys(PEG(4)-Biotin)-OH

N-alpha-(9-Fluorenylmethyloxycarbonyl)-N-epsilon-[15-(biotinamido)-4,7,10,13-tetraoxa-pentadecanoyl]-L-lysine

CAS-No. 1334172-64-3

Formula C 42H 59 N 5 O 11 S Mol. weight 842,01 g/mol

PEG4450 Fmoc-L-Lys(PEG(12)-Biotin)-OH

N-alpha-(9-Fluorenylmethyloxycarbonyl)-N-epsilon-[alpha-Biotin-omega-propionyl dodeca(ethylene glycol)]-L-lysine

CAS-No. 1334172-65-4

Formula C 58 H91N 5 O 19 S Mol. weight 1194,43 g/mol

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Biotinylation Reagents

9. Other Biotin Reagents

LS-1522 TT-232-Biotin diacetate

H-D-Phe-Cys-Tyr-D-Trp-Lys(Biotin)-Cys-Thr-NH2 (disulfide bridged)

Formula C 55H72N12O 11 S 3 (net) Mol. weight 1173,43 (net) g/mol

PEG2080 Biotin-TEG-Biotin

N,N‘-Bisbiotin-tetra(ethylene glycol)-diamine

CAS-No. 1263044-47-8

Formula C 30 H 52N 6 O 7S 2 Mol. weight 672,9 g/mol

PEG4850 Biotin-PEG-Si(OMe)3 (3 kDa)

alpha-Biotinyl-omega-trimethoxysilyl poly(ethylene glycol)

Mol. weight 3000 Da

PEG4855

Biotin-PEG-Si(OMe)3 (5 kDa)

alpha-Biotinyl-omega-trimethoxysilyl poly(ethylene glycol)

Mol. weight 5000 Da

PEG4860 Biotin-PEG-Si(OMe)3 (10 kDa)

alpha-Biotinyl-omega-trimethoxysilyl poly(ethylene glycol)

Mol. weight 10000 Da

PEG4865

Biotin-PEG-Si(OMe)3 (20 kDa)

alpha-Biotinyl-omega-trimethoxysilyl poly(ethylene glycol)

Mol. weight 20000 Da

PEG7125

Biotin-PEG(4)-amido-PEG(24)-amido-PEG(24)-DSPE

(2R)-3-((hydroxy((4,80,156,172-tetraoxo-176-(2-oxohexahydro- 1H-thieno[3,4-d]imidazol- 4-yl)- 7,10,13,16,19,22, 25,28,31,34,37,40,43,46,49,52,55,58,61,64,67,70,73,76,83,8 6,89,92,95,98,101,104,107,110,11

Formula C164H319 N 6 O 65PS Mol. weight 3478,37 g/mol

RL-8645

Biotin-NH-CH2-CH2-NH-Cysteine*TFA

N-Biotinyl-N’-cysteinyl ethylenediamine*TFA

CAS-No. 288144-42-3

Formula C15H27N 5 O 3 S 2*CF 3 CO 2H Mol. weight 389,53*114,02 g/mol

While nitriles in general may react with sulfhydryl groups (e.g., from cysteines) in a rather unspecific way, the advantage of α-cyanopyridines (2-picolinonitrils) is their strong selectivity for 1,2-aminothiols (e.g., provided as N-terminal cysteine or internally as non-canonical amino acid). Thus, this reaction may be used for the synthesis of cyclic peptides or to fuse ligands to peptide chains. It is biorthogonal, biocompatible, catalyst-free, and selective; it proceeds readily in aqueous solutions at physiological pH and ambient temperature. The formation of the resulting 2-thiazoline (alternative name: 2,5-dihydrothiazole) is driven by the release of ammonia.

Product details

RL-8635 Biotin-PEG(4)-CINA

2-cyano-N-(16-oxo-20-((3aS,4S,6aR)-2-oxohexahydro1H-thieno[3,4-d]imidazol-4-yl)-3,6,9,12-tetraoxa-15azaicosyl)isonicotinamide

Formula C 27H40 N 6 O 7S Mol. weight 592,71 g/mol

Reference:

→ The Cyanopyridine-Aminothiol Click Reaction: Expanding Horizons in Chemical Biology; C. Nitsche; SynLett. 2024; 35: A-E. arrow-up-right-from-square https://dx.doi.org/10.1055/a-2214-7612

Biotinylation Reagents

PEG1051 Biotin-PEG(12)-COOH 7

Biotin-PEG(12)-NHS 7 PEG5130 Biotin-PEG(12)-TFP 7 PEG7770 Biotin-PEG(12)-TFP-(Biotinidase resistant)

PEG1425

PEG1845 Biotin-PEG(4)-NHS-(Biotinidase resistant) 6

PEG8110 Biotin-PEG(4)-SS-Alkyne

PEG8100 Biotin-PEG(4)-SS-Azide

PEG8090 Biotin-PEG(4)-SS-COOH

PEG8120 Biotin-PEG(4)-SS-DBCO

LS-3930 Biotin-PEG(4)-SS-Tyramide

PEG7760 Biotin-PEG(4)-TFP-(Biotinidase resistant)

PEG4270 Biotin-PEG(48)-COOH

PEG6690 Biotin-PEG(6)-COOH

PEG4330 Biotin-PEG(7)-N3

Biotin-PEG(7)-NH2

Biotin-PEG-COOH (3 kDa)

(10 kDa)

PEG1057 Biotin-PEG-NHS (5 kDa)

PEG4780 Biotin-PEG-OPSS (10 kDa) 35

PEG4785 Biotin-PEG-OPSS (20 kDa) 35

PEG4770 Biotin-PEG-OPSS (3 kDa) 35

PEG4775 Biotin-PEG-OPSS (5 kDa) 35

PEG1212 Biotin-PEG-SH (10 kDa) 34

PEG1213 Biotin-PEG-SH (3 kDa) 33

PEG1214 Biotin-PEG-SH (5 kDa) 33

PEG4860 Biotin-PEG-Si(OMe)3 (10 kDa)

PEG4865 Biotin-PEG-Si(OMe)3 (20 kDa) 46

PEG4850 Biotin-PEG-Si(OMe)3 (3 kDa) 45

PEG4855 Biotin-PEG-Si(OMe)3 (5 kDa) 45

PEG6580 Biotin-PEG-SQA (10 kDa) 10

PEG6585 Biotin-PEG-SQA (20 kDa) 10

PEG6590 Biotin-PEG-SQA (3 kDa) 9

PEG6595 Biotin-PEG-SQA (5 kDa) 9

PEG6805 Biotin-PEG3-NH-Pentynoyl

Biotinylation Reagents

Code of Conduct

As business activity of Iris Biotech GmbH impacts people’s lives and health, it must be operated in ethical and correct manner and act with integrity and responsibility. To ensure high ethical standards and fair business practices, Iris Biotech GmbH applies an integrated policy known as its Code of Conduct.

In 2001 Iris Biotech GmbH was founded just at the beginning of the Biotech movement and the first remarkable breakthrough of biotech pharma products. Although the biotech field is rather young compared to other industries we believe on long-term business, a good partnership between our business partners and Iris Biotech GmbH and a good reputation. It is our duty as well as our responsibility to maintain and to extend this over the next generations – based on the principles of an honourable and prudent tradesman which based upon the concept of honourable entrepreneurship.

This Code of Conduct has been developed following the “Voluntary Guidelines for Manufacturers of Fine Chemical Intermediates and Active Ingredients” issued by AIME (Agrochemical & Intermediates Manufacturers in Europe) and the requirements of some of our business associates.

Iris Biotech GmbH commits to hold this Code of Conduct and to include and apply its principles in the management system and the company policies.

Ethics

Iris Biotech GmbH undertakes business in an ethical manner and acts with integrity. All corruption, extortion and embezzlement are prohibited. We do not pay or accept bribes or participate in other illegal inducements in business or government relationships. We conduct our business in compliance with all applicable anti-trust laws. Employees are encouraged to report concerns or illegal activities in the workplace, without threat of reprisal, intimidation or harassment.

Labour

Iris Biotech GmbH is committed to uphold the human rights of workers and to treat them with dignity and respect. Child labour, workplace harassment, discrimination, and harsh and inhumane treatment are prohibited. Iris Biotech GmbH respects the rights of the employees to associate freely, join or not join labour unions, seek representation and join workers’ councils. Employees are paid and their working timetable is established according to applicable wage and labour laws. Employees are able to communicate openly with management regarding working conditions without threat of reprisal, intimidation or harassment.

General Policies

Contracts and Secrecy Agreements are binding and the confidential information received is only used for intended purposes. Clear management and organizational structures exist to provide efficient normal working and to address problems quickly. Know-how is protected and intellectual property isrespected.

Health and Safety

Iris Biotech GmbH provides a safe and healthy working environment to the employees and protects them from overexposure to chemical and physical hazards. Products are produced, stored and shipped under the guidelines of the relevant chemical and safety legislation. Risks and emergency scenarios are identified and evaluated, and their possible impact is minimized by implementing emergency plans and written procedures. Safety information regarding hazardous materials is available to educate, train and protect workers from hazards. Preventive equipment and facilities maintenance is performed at suitable periods to reduce potential hazards. Employees are regularly trained in health and safety matters and are informed about product properties and risk classification when it is required.

Environment

Iris Biotech GmbH operates in an environmentally responsible and efficient manner, minimizing adverse impacts on the environment. Waste streams are managed to ensure a safe handling, movement, storage, recycling and reuse, before and after being generated. Systems to prevent and mitigate accidental spills and releases to the environment are in place. All required environmental permits and licenses are obtained and their operational and reporting requirements are complied with.

Production and Quality Management

A quality management system following the Good Distribution Practices (GDP rules) of Active Pharmaceutical Ingredients is established covering all the aspects of the worldwide distribution of products. Regular audits are performed to evaluate the efficiency and fulfilling of the quality system. Process controls to provide reproducible product quality are established. There are preventive maintenance procedures to ensure plant reliability and the lowest risk of failure. Staff is trained periodically about GMP and GDP rules. Procedures are established and installations are designed to avoid cross contamination. Batch and analytical records are kept for inspection and audit purposes for suitable periods according guidelines.

Research and Development

Research and development staff education is appropriate to their functional activity and they are trained to develop, optimize and scale-up the processes. Intellectual property is respected and knowhow protected. Development of manufacturing processes reflects the principles of the Green Chemistry according to the American Chemical Society Green Chemistry Institute. Animal testing is not used unless alternatives are not scientifically valid or accepted by regulators. If animal testing is carried out, animals are treated so that pain and stress are minimized.

Biotinylation Reagents

Terms and Conditions of Sales

All orders placed by a buyer are accepted and all contracts are made subject to the terms which shall prevail and be effective notwithstanding any variations or additions contained in any order or other document submitted by the buyer. No modification of these terms shall be binding upon Iris Biotech GmbH unless made in writing by an authorised representative of Iris Biotech GmbH.

Placing of Orders

Every order made by the buyer shall be deemed an offer by the buyer to purchase products from Iris Biotech GmbH and will not be binding on Iris Biotech GmbH until a duly authorised representative of Iris Biotech GmbH has accepted the offer made by the buyer. Iris Biotech GmbH may accept orders from commercial, educational or government organisations, but not from private individuals and Iris Biotech GmbH reserves the right to insist on a written order and/or references from the buyer before proceeding.

There is no minimum order value. At the time of acceptance of an order Iris Biotech GmbH will either arrange prompt despatch from stock or the manufacture/acquisition of material to satisfy the order. In the event of the latter Iris Biotech GmbH will indicate an estimated delivery date. In addition to all its other rights Iris Biotech GmbH reserves the right to refuse the subsequent cancellation of the order if Iris Biotech GmbH expects to deliver theproduct on or prior to the estimated delivery date. Time shall not be of the essence in respect of delivery of the products. If Iris Biotech GmbH is unable to deliver any products by reason of any circumstances beyond its reasonable control („Force Majeure“) then the period for delivery shall be extended by the time lost due to such Force Majeure. Details of Force Majeure will be forwarded by Iris Biotech GmbH to the buyer as soon as reasonably practicable.

Prices, Quotations and Payments

Prices are subject to change. For the avoidance of doubt, the price advised by Iris Biotech GmbH at the time of the buyer placing the order shall supersede any previous price indications. The buyer must contact the local office of Iris Biotech GmbH before ordering if further information is required. Unless otherwise agreed by the buyer and Iris Biotech GmbH, the price shall be for delivery ex-works. In the event that the buyer requires delivery of the products otherwise than ex-works the buyer should contact the local office of Iris Biotech GmbH in order to detail its requirements. Iris Biotech GmbH shall, at its discretion, arrange the buyer‘s delivery requirements including, without limitation, transit insurance, the mode of transit (Iris Biotech GmbH reserves the right to vary the mode of transit if any regulations or other relevant considerations so require) and any special packaging requirements (including cylinders). For the avoidance of doubt all costs of delivery and packaging in accordance with the buyer‘s requests over and above that of delivery in standard packaging ex-works shall be for the buyer‘s account unless otherwise agreed by both parties. Incoterms 2020 shall apply. Any tax, duty or charge imposed by governmental authority or otherwise and any other applicable taxes, duties or charges shall be for the buyer‘s account. Iris Biotech GmbH may, on request and where possible, provide quotations for multiple packs or bulk quantities, and non-listed items. Irrespective of the type of request or means of response all quotations must be accepted by the buyer without condition and in writing before an order will be accepted by Iris Biotech GmbH. Unless agreed in writing on different terms, quotations are valid for 30 days from the date thereof. Payment terms are net 30 days from invoice date unless otherwise agreed in writing. Iris Biotech GmbH reserves the right to request advance payment at its discretion. For overseas transactions the buyer shall pay all the banking charges of Iris Biotech GmbH. The buyer shall not

be entitled to withhold or set-off payment for the products for any reason whatsoever. Government/ Corporate Visa and MasterCard (and other such credit cards) may be accepted on approved accounts for payment of the products. Personal credit cards are not acceptable. Failure to comply with the terms of payment of Iris Biotech GmbH shall constitute default without reminder. In these circumstances Iris Biotech GmbH may (without prejudice to any other of its rights under these terms) charge interest to accrue on a daily basis at the rate of 2% per month from the date upon which payment falls due to the actual date of payment (such interest shall be paid monthly). If the buyer shall fail to fulfil the payment terms in respect of any invoice of Iris Biotech GmbH Iris Biotech GmbH may demand payment of all outstanding balances from the buyer whether due or not and/or cancel all outstanding orders and/or decline to make further deliveries or provision of services except upon receipt of cash or satisfactory securities. Until payment by the buyer in full of the price and any other monies due to Iris Biotech GmbH in respect of all other products or services supplied or agreed to be supplied by Iris Biotech GmbH to the buyer (including but without limitation any costs of delivery) the property in the products shall remain vested in Iris Biotech GmbH.

Shipping, Packaging and Returns

The buyer shall inspect goods immediately on receipt and inform Iris Biotech GmbH of any shortage or damage within five days. Quality problems must be notified within ten days of receipt. Goods must not be returned without prior written authorisation of Iris Biotech GmbH. Iris Biotech GmbH shall at its sole discretion replace the defective products (or parts thereof) free of charge or refund the price (or proportionate price) to buyer. Opened or damaged containers cannot be returned by the buyer without the written prior agreement of Iris Biotech GmbH. In the case of agreed damaged containers which cannot be so returned, the buyer assumes responsibility for the safe disposal of such containers in accordance with all applicable laws.

Product Quality, Specifications and Technical Information

Products are analysed in the Quality Control laboratories of Iris Biotech GmbH’s production partners by methods and procedures which Iris Biotech GmbH considers appropriate. In the event of any dispute concerning reported discrepancies arising from the buyer’s analytical results, determined by the buyer’s own analytical procedures, Iris Biotech GmbH reserves the right to rely on the results of own analytical methods of Iris Biotech GmbH. Certificates of Analysis or Certificates of Conformity are available at the discretion of Iris Biotech GmbH for bulk orders but not normally for prepack orders. Iris Biotech GmbH reserves the right to make a charge for such certification. Specifications may change and reasonable variation from any value listed should not form the basis of a dispute. Any supply by Iris Biotech GmbH of bespoke or custom product for a buyer shall be to a specification agreed by both parties in writing. Technical information, provided orally, in writing, or by electronic means by or on behalf of Iris Biotech GmbH, including any descriptions, references, illustrations or diagrams in any catalogue or brochure, is provided for guidance purposes only and is subject to change.

Safety

All chemicals should be handled only by competent, suitably trained persons, familiar with laboratory procedures and potential chemical hazards. The burden of safe use of the products of Iris Biotech GmbH vests in the buyer. The buyer assumes all responsibility for warning his employees, and any persons who might reasonably be expected to come into contact with the products, of all risks to person and property in any way connected with the products and for instructing them in their safe handling and use. The buyer also assumes the responsibility for the safe disposal of all products in accordance with all applicable laws.

Biotinylation Reagents

Uses, Warranties and Liabilities

All products of Iris Biotech GmbH are intended for laboratory research purposes and unless otherwise stated on product labels, in the catalogue and product information sheet of Iris Biotech GmbH or in other literature furnished to the buyer, are not to be used for any other purposes, including but not limited to use as or as components in drugs for human or animal use, medical devices, cosmetics, food additives, household chemicals, agricultural or horticultural products or pesticides. Iris Biotech GmbH offers no warranty regarding the fitness of any product for a particular purpose and shall not be responsible for any loss or damage whatsoever arising there from. No warranty or representation is given by Iris Biotech GmbH that the products do not infringe any letters patent, trademarks, registered designs or other industrial rights. The buyer further warrants to Iris Biotech GmbH that any use of the products in the United States of America shall not result in the products becoming adulterated or misbranded within the meaning of the Federal Food, Drug and Cosmetic Act (or such equivalent legislation in force in the buyer‘s jurisdiction) and shall not be materials which may not, under sections 404, 505 or 512 of the Act, be introduced into interstate commerce. The buyer acknowledges that, since the products of Iris Biotech GmbH are intended for research purposes, they may not be on the Toxic Substances Control Act 1976 („TSCA“) inventory. The buyer warrants that it shall ensure that the products are approved for use under the TSCA (or such other equivalent legislation in force in the buyer‘s jurisdiction), if applicable. The buyer shall be responsible for complying with any legislation or regulations governing the use of the products and their importation into the country of destination (for the avoidance of doubt to include, without limitation, the TSCA and all its amendments, all EINECS, ELINCS and NONS regulations). If any licence or consent of any government or other authority shall be required for the acquisition, carriage or use of the products by the buyer the buyer shall obtain the same at its own expense and if necessary produce evidence of the same to Iris Biotech GmbH on demand. Failure to do so shall not entitle the buyer to withhold or delay payment. Any additional expenses or charges incurred by Iris Biotech GmbH resulting from such failure shall be for the buyer‘s account. Save for death or personal injury caused by negligence of Iris Biotech GmbH, sole obligation of Iris Biotech GmbH and buyer‘s exclusive remedy with respect to the products proved to the satisfaction of Iris Biotech GmbH to be defective or products incorrectly supplied shall be to accept the return of said products to Iris Biotech GmbH for refund of the actual purchase price paid by the buyer (or proportionate part thereof), or replacement of the defective product (or part thereof) with alternative product. Iris Biotech GmbH shall have no liability to the buyer under or arising directly or indirectly out of or otherwise in connection with the supply of products by Iris Biotech GmbH to the buyer and/or their re-sale or use by the buyer or for any product, process or services of the buyer which in any way comprises the product in contract tort (including negligence or breach of statutory duty) or otherwise for pure economic loss, loss of profit, business, reputation, depletion of brand, contracts, revenues or anticipated savings or for any special indirect or consequential damage or loss of any nature except as may otherwise be expressly provided for in these terms. All implied warranties, terms and representations in respect of the products (whether implied by statute or otherwise) are excluded to the fullest extent permitted by law. The buyer shall indemnify Iris Biotech GmbH for and against any and all losses, damages and expenses, including legal fees and other costs of defending any action, that Iris Biotech GmbH may sustain or incur as a result of any act or omission by the buyer, its officers, agents or employees, its successors or assignees, its customers or all other third parties, whether direct or indirect, in connection with the use of any product. For the avoidance of doubt and in the event that Iris Biotech GmbH supplies bespoke or custom product to the buyer‘s design or specification, this indemnity shall extend to include any claim by a third party that the manufacture of the product for the buyer or the use of the product by the buyer infringes the intellectual property rights of any third party.

General

Iris Biotech GmbH shall be entitled to assign or sub-contract all or any of its rights and obligations hereunder. The buyer shall not be entitled to assign, transfer, sub-contract or otherwise delegate any of its rights or obligations hereunder. Any delay or forbearance by Iris Biotech GmbH in exercising any right or remedy under these terms shall not constitute a waiver of such right or remedy. If any provision of these terms is held by any competent authority to be invalid or unenforceable in whole or in part the validity of the other provisions of these terms and the remainder of the provision in question shall not be affected. These terms shall be governed by German Law and the German Courts shall have exclusive jurisdiction for the hearing of any dispute between the parties save in relation to enforcement where the jurisdiction of the German Courts shall be non-exclusive.

Get in Contact Distribution Partners

Iris Biotech GmbH

Adalbert-Zoellner-Str. 1 95615 Marktredwitz Germany

+49 (0) 9231 97121-0

+49 (0) 9231 97121-99 info@iris-biotech.de www.iris-biotech.de

The list contains the current distributors of Iris Biotech in different regions of the world. The latest list of distribution partners and contact details is available at: arrow-up-right-from-square www.iris-biotech.de/distribution-partner

China: Chengdu Yoo Technology Co., Ltd.

Japan:

BizCom Japan, Inc.

Shigematsu & Co., Ltd

Cosmo Bio Co., Ltd.

USA & Canada: Peptide Solutions LLC

India, Bangladesh, Oman, Sri Lanka, United Arab Emirates: Sumit Biosciences Pvt Ltd.